are they just… using it till it evaporates?

Yes, but I’d say it goes further. Using it until it evaporates isn’t a side effect of some other cooling process. Evaporating the water is the cooling process.

I’d buy a printer. If you’re looking for something easy, an assembled Prusa Core One. If you want something more expandable/project-like then probably a Voron.

Edit: a letter

Signal is gaining the network effect. Session is not. Don’t let perfect be the enemy of good enough.